docs: def class_wise_error_rate(self, event_label):
          """Class-wise error rate metrics (error_rate, deletion_rate, and insertion_rate)
  
          Returns
          -------
          dict
              results in a dictionary format
  
          """
  
          deletion_rate = metric.deletion_rate(
              Nref=self.class_wise[event_label]['Nref'],
              Ndeletions=self.class_wise[event_label]['Nfn']
          )
  
          insertion_rate = metric.insertion_rate(
              Nref=self.class_wise[event_label]['Nref'],
              Ninsertions=self.class_wise[event_label]['Nfp']
          )
  
          error_rate = metric.error_rate(
              deletion_rate_value=deletion_rate,
              insertion_rate_value=insertion_rate
          )
  
          return {
              'error_rate': error_rate,
              'deletion_rate': deletion_rate,
              'insertion_rate': insertion_rate
          }